Searchers spent a third day Wednesday looking for a Glacier National Park employee who didn’t return from a hike they believe he took in a steep, mountainous part of the park in Montana, officials said.

Jacob “Jake” Rigby, 27, was reported overdue at 2 a.m. Monday after failing to return from a hike he started on his personal time the day before, the park said in a news release.

On Tuesday - the second day of a search involving ground crews and helicopters - searchers found what park officials believe is his signature on a register at the summit of the park’s Brave Dog Mountain. It was dated Sunday, the park said.

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